#define _CRT_SECURE_NO_WARNINGS 1
#include<ctype.h>
#include<stdio.h>

int islower(int c);

int main()
{
	int i = 0;
	char str[] = "test string.\n";
	char c;
	while (str[i])
	{
		c = str[i];
		if (islower(c))
			c -= toupper(c);
		putchar(c);
		i++;
	}
	return 0;
}